AR1100-I/SS

Overview

The Microchip Technology AR1100-I/SS is a resistive touch screen controller in a 20-lead SSOP package. It supports 4, 5, and 8-wire analog resistive sensors with 10-bit resolution. The device features automatic detection of USB V2.0 Full Speed or UART (9600 baud) communication protocols. Operating voltage ranges from 3.3V to 5.0V, with an operating current of less than 25 mA during touch activity. It includes 96 bytes of user EEPROM for configuration storage and operates within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Automatic detection and selection between USB V2.0 Full Speed and UART communication modes
• Support for 4, 5, and 8-wire analog resistive touch screens with built-in drift compensation
• USB enumeration as HID-MOUSE, HID-DIGITIZER, or HID-GENERIC devices
• Industrial temperature range (-40°C to +85°C) and RoHS compliance

Applications

• Point of Sale (POS) terminals
• Self-service kiosks
• Industrial control panels
• Medical devices
• Portable instruments

Procurement Notes

Verify the ordering suffix '-I/SS' confirms the Industrial temperature grade (-40°C to +85°C) and the 20-lead Shrink Small Outline Package (SSOP). Confirm that the specific revision matches the required firmware capabilities, such as field flash updatability and driver compatibility for the target operating system.

Selection Notes

Select this component when a universal resistive touch solution is required with minimal host driver development. The automatic protocol detection simplifies integration into systems supporting either USB or RS-232 interfaces. Ensure the touch panel electrical characteristics, such as layer-to-layer capacitance and lead-to-lead resistance, fall within the specified operational limits for optimal performance.

Part Context

The AR1100 series builds upon the AR1000 family, offering enhanced integration for resistive touch applications. The 'AR1100' designation identifies the specific model with USB and RS-232 capabilities, while the '-I/SS' suffix denotes the industrial temperature rating and SSOP packaging format used in this part number.

Replacement Considerations

The AR1000 series serves as a predecessor but lacks native USB support. Direct pin-compatible replacements within the same package are limited; verify interface requirements before substituting. No other public substitute part numbers are confirmed for this specific combination of features and package.